A database is an organized collection of data, managed by software called a database management system. Please see “What is a Database?” on Oracle’s website if you’d like to know more about the general concept.
Mathesar provides a friendly user interface for databases managed by the PostgreSQL database management software. This means that you can connect one or more PostgreSQL databases to Mathesar and use Mathesar to interact with your data.
Within a database, you can store different kinds of data in different Schemas. Data is stored in Tables and can also be manipulated through Views.